However, in 2020, Revel et al. reported the first detailed spectroscopic study of \(^{28}\) F [1]}
and found the ground state of \(^{28}\) F to be a resonance at 199 keV with a negative parity.
The reconstructed \(^{28}F+n\)  momentum distribution following the neutron removal from \(^{29}\) F indicated that it arises mainly from the \(p_{3/2}\)  neutron shell,
with a \(l=1\)  content of about \(80\%\) , placing \(^{28}\) F inside the IOI.
In line with this finding, a subsequent study by Bagchi et al. [2]} demonstrated the presence of a halo structure in the ground state of \(^{29}\) F
dominated by \(l=1\)  partial waves, and Gamow shell model calculations [3]} suggested the formation of a two-neutron halo in \(^{31}\) F.
